Answer
code
Work Step by Step
# 12.6 (Tkinter: two circles intersect?) Using the Circle2D class you defined in Exercise
# 8.18, write a program that enables the user to point the mouse inside a circle
# and drag it. As the circle is being dragged, the label displays whether two circles
# overlap, as shown in Figure 12.18.
import math
from tkinter import *
class Circle2D:
def __init__(self, x=0, y=0, radius=0):
self.__x__ = x
self.__y__ = y
self.__r__ = radius
def getX(self):
return self.__x__
def getY(self):
return self.__y__
def getRadius(self):
return self.__r__
def setX(self, x):
self.__x__ = x
def setY(self, y):
self.__y__ = y
def setRadius(self, radius):
self.__r__ = radius
def getArea(self):
return math.pi * self.getRadius() ** 2
def getPerimeter(self):
return math.pi * 2 * self.getRadius()
def containsPoint(self, x, y):
dis = math.sqrt((self.getX() - x) ** 2 + (self.getY() - y) ** 2)
return True if dis <= self.getRadius() else False
def contains(self, circle):
dis = math.sqrt((self.getX() - circle.getX()) ** 2 + (self.getY() - circle.getY()) ** 2)
return True if self.getRadius() >= dis + circle.getRadius() else False
def overlaps(self, circle):
dis = math.sqrt((self.getX() - circle.getX()) ** 2 + (self.getY() - circle.getY()) ** 2)
return True if dis <= self.getRadius() + circle.getRadius() else False
def __contains__(self, circle):
return circle.contains(self)
def __eq__(self, circle):
return True if self.getRadius() == circle.getRadius() else False
def __ne__(self, circle):
return True if self.getRadius() != circle.getRadius() else False
def __cmp__(self, circle):
if self.getRadius() > circle.getRadius():
return 1
elif self.getRadius() < circle.getRadius():
return -1
else:
return 0
def __lt__(self, circle):
return self.getRadius() < circle.getRadius()
def __gt__(self, circle):
return self.getRadius() > circle.getRadius()
def __ge__(self, circle):
return self.getRadius() >= circle.getRadius()
def __le__(self, circle):
return self.getRadius() <= circle.getRadius()
def displayCircle(c, text):
canvas.delete(text)
canvas.create_oval(c.getX() - c.getRadius(),
c.getY() - c.getRadius(), c.getX() + c.getRadius(), c.getY() + c.getRadius(), tags=text)
canvas.create_text(c.getX(), c.getY(), text=text, tags=text)
def mouseMoved(event):
if c1.containsPoint(event.x, event.y):
c1.setX(event.x)
c1.setY(event.y)
displayCircle(c1, "c1")
if c1.overlaps(c2):
label["text"] = "Two circles intersect"
else:
label["text"] = "Two circles don't intersect"
if c2.containsPoint(event.x, event.y):
c2.setX(event.x)
c2.setY(event.y)
displayCircle(c2, "c2")
if c1.overlaps(c2):
label["text"] = "Two circles intersect"
else:
label["text"] = "Two circles don't intersect"
window = Tk() # Create a window
window.title("Two Circles") # Set title
width = 300
height = 100
label = Label(window, text="Two circles intersect")
label.pack()
canvas = Canvas(window, width=width, height=height)
canvas.pack()
canvas.bind("", mouseMoved)
c1 = Circle2D(10, 10, 30)
c2 = Circle2D(30, 40, 20)
displayCircle(c1, "c1")
displayCircle(c2, "c2")
window.mainloop()
